split decision

from The American Heritage® Dictionary of the English Language, 5th Edition.

• noun A decision declaring the winner of a boxing match in which the judges and referee are not unanimous in their opinions.

from Wiktionary, Creative Commons Attribution/Share-Alike License.

• noun an outcome in several full-contact combat sports where two of the three judges score for the same fighter as the winner, while the third judge scores for the other fighter.

from WordNet 3.0 Copyright 2006 by Princeton University. All rights reserved.

• noun a boxing decision in which the judges are not unanimous